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How to Display Binary Data as Image in React?

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Sometimes, we want to display binary data as image in React.

In this article, we’ll look at how to display binary data as image in React.

Display Binary Data as Image in React

To display binary data as image in React, we can convert the image’s binary data to a base64 URL.

Then we can set the src attribute of the img element to the base64 URL.

For instance, we write:

import React, { useEffect, useState } from "react";

const imageUrl =
  "https://i.picsum.photos/id/566/200/300.jpg?hmac=gDpaVMLNupk7AufUDLFHttohsJ9-C17P7L-QKsVgUQU";

export default function App() {
  const [imgUrl, setImgUrl] = useState();

  const getImg = async () => {
    const response = await fetch(imageUrl);
    const imageBlob = await response.blob();
    const reader = new FileReader();
    reader.readAsDataURL(imageBlob);
    reader.onloadend = () => {
      const base64data = reader.result;
      setImgUrl(base64data);
    };
  };

  useEffect(() => {
    getImg();
  }, []);

  return (
    <div>
      <img src={imgUrl} alt="" />
    </div>
  );
}

We have the getImg function that makes a GET request to get an image from the imageUrl with fetch.

Then we call response.blob to convert the binary data response to a blob object.

Next, we create a FileReader instance and call the readAsDataURL method on it with the imageBlob blob object as the argument to convert the data into a base64 URL string.

Finally, we call setImgUrl with the base64 string to set the imgUrl value to the base64 string.

And then we use imgUrl as the value of the img element’s src attribute.

Now we should see the image displayed on the screen.

Conclusion

To display binary data as image in React, we can convert the image’s binary data to a base64 URL.

Then we can set the src attribute of the img element to the base64 URL.

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